

Discover the Efest Slim K4 charger, a versatile recharging device specifically designed for batteries of types Li-Ion, IMR, INR, and ICR. With the capacity to accommodate up to four batteries simultaneously, this charger offers exceptional flexibility with its adaptive charging options: enjoy a fast 2A charge for a single battery, an efficient 1A charge for two batteries, or a standard 0.5A charge for three or four batteries. For convenient and modern use, the Slim K4 is equipped with a USB type-C port, ensuring a reliable and universal connection. Each battery slot features a distinct light indicator, allowing for clear and instant tracking of each battery's charging status. The intuitive design and advanced features of the Efest Slim K4 charger make it the ideal choice for demanding users seeking a reliable and high-performing charging solution for their rechargeable batteries.
Comes with:
• 1x Slim K4 Charger
• 1x USB-C Cable
• 1x Warranty Card
The Efest Slim K4 USB-C Charger represents the pinnacle of battery charging technology. Designed with a special focus on quality and reliability, this device incorporates a sophisticated charging algorithm that ensures optimal recharging for your batteries. Each charging channel has advanced protections, including against polarity reversal, short-circuits, and overcurrents, thus ensuring safe and efficient use.
The Efest Slim K4 is designed to be universally compatible with a wide range of Li-ion and LiMn (IMR) batteries, including popular models such as the 18650, 20700, 21700, and 26650, as well as less common sizes such as the 10440, 14500, 16340, 17340, 18350, 18500, and 26500. Its versatility makes it ideal for users of various electronic devices.
For an enhanced user experience, the Slim K4 is equipped with charging indicators located above each battery slot, providing a clear visual indication of the charge status:
With safety being an absolute priority, the Slim K4 charger incorporates all necessary protections for risk-free charging:
In summary, the Efest Slim K4 USB-C Charger is the perfect solution for those looking for a reliable, secure, and compatible battery charger. Its superior design, advanced safety features, and intuitive charging indicators make it a must-have for demanding users.
Data sheet